The singer, 34, nd her husband Justin Scott have revealed the happy news, explaining the couple has been trying for a baby ever since it wed in Barbados in February.
"We knew soon after we got married that we'd be very happy for baby number two to come along," the 34-year-old mother said.
"When I first met Justin 14 years ago, I told him I wanted four children. We're both over the moon.
"Before I had even taken a test, I knew it instinctively. I wasn't suffering from morning sickness but tell-tale changes in my body made me certain I was expecting. When I took a home test early one morning to make sure, it confirmed what I'd already sensed. I was thrilled. The first thing I did was to wake up Justin and tell him, 'You're going to be a daddy again!"'